43421916397 has 2 divisors, whose sum is σ = 43421916398. Its totient is φ = 43421916396.

The previous prime is 43421916353. The next prime is 43421916401. The reversal of 43421916397 is 79361912434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38113191076 + 5308725321 = 195226^2 + 72861^2 .

It is a cyclic number.

It is not a de Polignac number, because 43421916397 - 2²⁷ = 43287698669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43421916397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43421916337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710958198 + 21710958199.

It is an arithmetic number, because the mean of its divisors is an integer number (21710958199).

Almost surely, 2^43421916397 is an apocalyptic number.

It is an amenable number.

43421916397 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421916397 is an equidigital number, since it uses as much as digits as its factorization.

43421916397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The spelling of 43421916397 in words is "forty-three billion, four hundred twenty-one million, nine hundred sixteen thousand, three hundred ninety-seven".